Currently my workaround is to paste the text in the Notes app and copy from there the plain text to paste it to, for example the Mail app.
How can I copy formatted text and paste it as plain text, for example in the Mail app?
At least from iOS 13 onwards, the following copies without formatting:
This copies without formatting, at least in Safari, Mail and probably many other apps.
I use the "Share > Copy" trick:
Still (too) many hoops to jump through but at least you don't need to switch between apps.
On iPadOS 13.4.1, I just tested ⇧ Shift ⌥ Option ⌘ Command V and it will paste without formatting.
Here's a workaround that worked for me:
Now the formatting should be stripped away.